Jim,
there are iconic props for most of the holidays that avoid any cultural issues. Autumn calls for bales of hay, corn stalks and pumpkins. No need to carve.

Xmas time calls for Santa, Reindeer, sleds, etc. but I stay away from the religious references.

4th of July calls for Red White & Blue and starbursts. I also have a huge flag I hang as a backdrop. Nobody complains about that.

In general, if you're doing a holiday-themed shoot, you can keep things generic and not risk offending anyone.

Jim